HSEC-2023-0005 (CVE-2013-0243)

Vulnerability from osv_haskell – Published: 2025-11-14 14:45 – Updated: 2025-11-14 14:45 – Source website

Summary

tls-extra: certificate validation does not check Basic Constraints

Details

tls-extra: certificate validation does not check Basic Constraints

tls-extra does not check the Basic Constraints extension of a certificate in certificate chain processing. Any certificate is treated as a CA certificate. As a consequence, anyone who has a valid certificate can use it to sign another one (with an arbitrary subject DN/domain name embedded into it) and have it accepted by tls. This allows MITM attacks on TLS connections.

References

URL

Type

	https://www.openwall.com/lists/oss-security/2013/…	DISCUSSION
	https://github.com/haskell-tls/hs-tls/issues/29	REPORT
	https://github.com/haskell-tls/hs-tls/commit/1588…	FIX

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0005.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0005.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "tls-extra"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.4.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2013-0243"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# tls-extra: certificate validation does not check Basic Constraints\n\n*tls-extra* does not check the Basic Constraints extension of a\ncertificate in certificate chain processing.  Any certificate is\ntreated as a CA certificate.  As a consequence, anyone who has a\nvalid certificate can use it to sign another one (with an arbitrary\nsubject DN/domain name embedded into it) and have it accepted by\n*tls*.  This allows MITM attacks on TLS connections.\n",
  "id": "HSEC-2023-0005",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "DISCUSSION",
      "url": "https://www.openwall.com/lists/oss-security/2013/01/30/6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/haskell-tls/hs-tls/issues/29"
    },
    {
      "type": "FIX",
      "url": "https://github.com/haskell-tls/hs-tls/commit/15885c0649ceabd2f4d2913df8ac6dc63d6b3b37"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "tls-extra: certificate validation does not check Basic Constraints"
}

CVE-2013-0243 (GCVE-0-2013-0243)

Vulnerability from cvelistv5 – Published: 2019-12-05 15:16 – Updated: 2024-08-06 14:18

Summary

haskell-tls-extra before 0.6.1 has Basic Constraints attribute vulnerability may lead to Man in the Middle attacks on TLS connections

Severity

No CVSS data available.

CWE

constraints vulnerability

Assigner

redhat redhat root Scorecard

References

3 references

URL	Tags
https://security-tracker.debian.org/tracker/CVE-2…	x_refsource_MISC
https://access.redhat.com/security/cve/cve-2013-0243	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2013/01/30/6	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
haskell-tls-extra	haskell-tls-extra	Affected: < 0.6.1

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

HSEC-2023-0005 (CVE-2013-0243)

tls-extra: certificate validation does not check Basic Constraints

CVE-2013-0243 (GCVE-0-2013-0243)

Tags

Sightings

Nomenclature

Related by attack behaviour